Note, 'On Mr. W. Brooks' enquiry of Mr. W. R. Clavel' by Henry Oldenburg Notes that in his letter to Mr. Clavel, Mr. Brooks asked what the charge would be to procure the following instruments: A thermometer, 'for ye heat and cold of air', and a wheel barometer, 'for finding ye pressure of ye air, to predict weather'. Subject: Scientific instruments 17th century